Display panel and fabrication method thereof

Abstract

A display panel and a fabrication method thereof are provided. The display panel includes: an array substrate including a display portion and a bending portion connected to a side of the display portion; a functional film layer at a side of the display portion; and a protective layer covering the bending portion. The protective layer and the functional film layer are at the same side of the array substrate. The protective layer includes a first bending portion arranged adjacent to the functional film layer, and a second bending portion connected to a side of the first bending portion away from the functional film layer. A distance between an edge of the second bending portion away from the first bending portion and the functional film layer in a first direction perpendicular to an interface between the display portion and the bending portion is the largest in the protective layer.

1 . A display panel, comprising:
 an array substrate comprising a display portion and a bending portion, the bending portion being connected to a side of the display portion;   a functional film layer arranged at a side of the display portion and comprising at least one of a filter layer and a touch control layer;   a protective layer covering the bending portion, the protective layer and the functional film layer being located at a same side of the array substrate, and the protective layer comprising:
 a first bending portion arranged adjacent to the functional film layer; and 
 a second bending portion connected to a side of the first bending portion away from the functional film layer, the second bending portion comprising a second edge away from the first bending portion, 
   wherein a distance between the second edge and the functional film layer in a first direction is largest in the protective layer, and the first direction is perpendicular to an interface between the display portion and the bending portion;   wherein a difference between a maximum thickness of the first bending portion and a minimum thickness of the second bending portion is less than or equal to 0.05 mm; and   wherein a cover plate is located at one side of the functional film layer away from the array substrate.   
     
     
         2 . The display panel according to  claim 1 , wherein the maximum thickness of the first bending portion is greater than or equal to 0.13 mm and less than or equal to 0.15 mm, and the minimum thickness of the second bending portion is greater than or equal to 0.08 mm and less than or equal to 0.1 mm. 
     
     
         3 . The display panel according to  claim 1 , wherein the array substrate further comprises a bonding portion, the bending portion is connected between the display portion and the bonding portion, and the display panel further comprises:
 a chip bonded to the bonding portion, the chip and the functional film layer being located at the same side of the array substrate; and   a first bottom film at a side of the display portion away from the functional film layer;   a second bottom film at a side of the bonding portion away from the chip, wherein:   the first bending portion comprises a first edge connected with the second bending portion;   in the first direction, the first edge is between the first bottom film and the second edge, and between the second bottom film and the second edge; and   a distance between the first edge and the first bottom film in the first direction is less than or equal to a distance between the first edge and the second bottom film in the first direction.   
     
     
         4 . The display panel according to  claim 3 , wherein a distance between an edge of the first bottom film facing the first edge and an edge of the second bottom film facing the first edge in the first direction is greater than or equal to 0 mm and less than or equal to 0.2 mm. 
     
     
         5 . The display panel according to  claim 4 , wherein the distance between the first edge and the first bottom film in the first direction is greater than or equal to 0.125 mm and less than or equal to 0.225 mm;
 the distance between the first edge and the second bottom film in the first direction is greater than or equal to 0.125 mm and less than or equal to 0.425 mm.   
     
     
         6 . The display panel according to  claim 1 , wherein an arc length of the first bending portion is greater than or equal to 0.188 mm and less than or equal to 0.235 mm. 
     
     
         7 . The display panel according to  claim 6 , wherein an arc length of the second bending portion is greater than or equal to 0.235 mm and less than or equal to 0.285 mm. 
     
     
         8 . The display panel according to  claim 3 , wherein:
 the bonding portion is parallel to the display portion;   in a second direction, a distance between the second edge and the bonding portion is greater than a distance between the second edge and the display portion, and the second direction is perpendicular to a plane where the display portion is located; and   a distance between the bonding portion and the display portion is 0.3-0.7 mm.   
     
     
         9 . The display panel according to  claim 3 , wherein the display panel further comprises:
 a heat dissipation layer at a side of the first bottom film away from the display portion; and   an adhesive layer between the second bottom film and the heat dissipation layer.   
     
     
         10 . The display panel according to  claim 9 , wherein a distance between the heat dissipation layer and the first edge in the first direction is smaller than a distance between the adhesive layer and the first edge in the first direction. 
     
     
         11 . The display panel according to  claim 1 , wherein:
 a thickness of the first bending portion gradually decreases from an edge close to the functional film layer to a side away from the functional film layer; and   a thickness of the second bending portion gradually decreases from an edge close to the first bending portion to an edge away from the first bending portion.   
     
     
         12 . The display panel according to  claim 1 , wherein the protective layer further comprises:
 a third bending portion connected to a side of the second bending portion away from the first bending portion, a thickness of the third bending portion gradually increasing from an edge close to the second bending portion to an edge away from the second bending portion.   
     
     
         13 . A display panel, comprising:
 an array substrate comprising a display portion and a bending portion, the bending portion being connected to one side of the display portion;   a functional film layer arranged at a side of the display portion and comprising at least one of a filter layer and a touch control layer;   a protective layer covering the bending portion, the protective layer and the functional film layer being located at a same side of the array substrate, and the protective layer comprising:
 a first bending portion arranged adjacent to the functional film layer; and 
 a second bending portion connected to a side of the first bending portion away from the functional film layer, the second bending portion comprising a second edge away from the first bending portion, 
   wherein a distance between the second edge and the functional film layer in a first direction is largest in the protective layer, and the first direction is perpendicular to an interface between the display portion and the bending portion;   wherein an elastic modulus of the first bending portion is smaller than that of the second bending portion; and   wherein a cover plate is located at one side of the functional film layer away from the array substrate.   
     
     
         14 . A fabrication method of a display panel, comprising:
 providing a flexible array substrate, wherein the array substrate has a flat plate structure and comprises a display portion, a bonding portion, and a bending portion connected between the display portion and the bonding portion;   forming a functional film layer on the array substrate, wherein an orthographic projection of the functional film layer on the array substrate is in the display portion;   forming a protective layer on the array substrate, wherein the protective layer and the functional film layer are located on the same side of the array substrate, and an orthographic projection of the protective layer on the array substrate is in the bending portion, wherein the protective layer comprises a first bending portion at a side close to the functional film layer and a second bending portion at a side of the first bending portion away from the functional film layer, and a rigidity of the first bending portion is smaller than that of the second bending portion; and   bending the bending portion so that the bonding portion is at a side of the display portion away from a display side thereof.   
     
     
         15 . The fabrication method of the display panel according to  claim 14 , wherein a thickness of the first bending portion is smaller than that of the second bending portion. 
     
     
         16 . The fabrication method of the display panel according to  claim 15 , wherein forming the protective layer on the array substrate comprises:
 forming a protective layer material with uniform thickness on the array substrate for several times, wherein multiple layers of protective layer material are configured to form the protective layer;   wherein the number of times of forming the protective layer material on the first bending portion is less than that of forming the protective layer material on the second bending portion.   
     
     
         17 . The fabrication method of the display panel according to  claim 15 , wherein forming the protective layer on the array substrate comprises:
 forming a colloidal protective layer material on the array substrate, the protective layer material being configured to form the protective layer;   wherein the first bending portion is in a climbing area of the protective layer material.   
     
     
         18 . The fabrication method of the display panel according to  claim 14 , wherein an elastic modulus of the first bending portion is smaller than that of the second bending portion. 
     
     
         19 . The fabrication method of the display panel according to  claim 18 , wherein forming the protective layer on the array substrate comprises:
 forming a colloidal protective layer material on the array substrate; and   curing the protective layer material, wherein a curing degree of the first bending portion is smaller than that of the second bending portion.   
     
     
         20 . The fabrication method of the display panel according to  claim 18 , wherein forming the protective layer on the array substrate comprises:
 forming a colloidal protective layer material on the array substrate;   curing the whole protective layer material; and   softening the first bending portion.